package apiday02.collection;

import java.util.ArrayList;
import java.util.Collection;

/**
 * 集合中装的是元素的地址
 */
public class CollectionDemo3 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        Point p =new Point(1,2);
        c.add(p);
        System.out.println(p);
        System.out.println(c);

        p.setX(50);
        System.out.println(p);
        System.out.println(c);

    }
}
